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y = 2x-5
maka x+3 = 2x-5
2x-x = 3+5
x = 8
y = x+3
y = 8+3
y = 11
maka himpunan penyelesaian adalah x=8, y=11
2) penghapus ibaratkan x
buku ibaratkan y
5x = y...(1) -> 5x-y = 0
2x+3y = 13600...(2)
cari nilai x dan y lewat eliminasi
5x-y = 0 --> 15x-3y = 0
2x+3y = 13600
--------------------- +
17x = 13600
x = 800
5x = y
maka (5x800) = y
y= 4000
ditanya 3 penghapus dan 4 buku
3x + 4y = 2400+16000
= Rp 18400